Updated kernel packages that fix two security issues and several bugs are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. Description The kernel packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issues: A NULL pointer dereference flaw was found in the nf_ct_frag6_reasm function in the Linux kernel"s netfilter IPv6 connection tracking implementation. A remote attacker could use this flaw to send specially-crafted packets to a target system that is using IPv6 and also has the nf_conntrack_ipv6 kernel module loaded, causing it to crash. A flaw was found in the way the Linux kernel"s key management facility handled replacement session keyrings on process forks. A local, unprivileged user could use this flaw to cause a denial of service. Red Hat would like to thank an anonymous contributor working with the Beyond Security SecuriTeam Secure Disclosure program for reporting CVE-2012-2744. This update also fixes the following bugs: Previously introduced firmware files required for new Realtek chipsets contained an invalid prefix in the file names, for example "/lib/firmware/rtl_nic/rtl_nic_rtl8168d-1.fw". This update corrects these file names. For example, the aforementioned file is now correctly named "/lib/firmware/rtl_nic/rtl8168d-1.fw". This update blacklists the ADMA428M revision of the 2GB ATA Flash Disk device. This is due to data corruption occurring on the said device when the Ultra-DMA 66 transfer mode is used. When the "libata.force=5:pio0,6:pio0" kernel parameter is set, the aforementioned device works as expected. On Red Hat Enterprise Linux 6, mounting an NFS export from a Windows 2012 server failed due to the fact that the Windows server contains support for the minor version 1 of the NFS version 4 protocol only, along with support for versions 2 and 3. The lack of the minor version 0 support caused Red Hat Enterprise Linux 6 clients to fail instead of rolling back to version 3 as expected. This update fixes this bug and mounting an NFS export works as expected. On ext4 file systems, when fallocate failed to allocate blocks due to the ENOSPC condition for a file larger than 4 GB, the size of the file became corrupted and, consequently, caused file system corruption. This was due to a missing cast operator in the "ext4_fallocate" function. With this update, the underlying source code has been modified to address this issue, and file system corruption no longer occurs. Users should upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.